-63.41% is the change from 839 to 307
Calculation steps:
[( 307 - 839 ) ÷ 839] x 100 = -63.41%
Formula
Percentage change = [(307 - 839) / 839] x 100
Subtract the new number by the original number
307 - 839 = -532
-532 ÷ 839 = -0.634088200238379
-0.634088200238379 x 100 = -63.41%